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Journal Article

Detection of persistent gamma-ray emission toward SS433/W50

MPS-Authors
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Bordas Coma,  Pol
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Yang,  Ruizhi
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Kafexhiu,  Ervin
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Aharonian,  Felix A.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;
DIAS, Dublin;

External Resource

http://iopscience.iop.org/2041-8205/807/1/L8/
(Publisher version)

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Fulltext (public)

1411.7413.pdf
(Preprint), 162KB

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Citation

Bordas Coma, P., Yang, R., Kafexhiu, E., & Aharonian, F. A. (2015). Detection of persistent gamma-ray emission toward SS433/W50. The Astrophysical Journal Letters, 807(1): L8. doi:10.1088/2041-8205/807/1/L8.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-C415-3
Abstract
The microquasar SS433 features the most energetic jets known in our Galaxy. A large fraction of the jet kinetic power is delivered to the surrounding W50 nebula at the jet termination shock, from which high-energy emission and cosmic-ray production have been anticipated. Here we report on the detection of a persistent gamma-ray signal from the direction of SS433/W50 with the Fermi Large Area Telescope. The steady flux and a narrow spectral energy distribution with a maximum around 250 MeV suggest that gamma-rays are rendered by the bulk jet kinetic power through proton-proton collisions at the SS433/W50 interaction regions. If the same mechanism is operating in other baryon-loaded microquasar jets, their collective contribution may represent a significant fraction of the total galactic cosmic-ray flux at GeV energies.